JP2021081042A - Flow passage selector valve - Google Patents

Abstract

To provide a flow passage selector valve which inhibits entry of water and impurities from an outside while discharging fluid entering a shaft hole to the outside unfailingly.SOLUTION: A collar member 46 is provided at a shaft hole 44 of a housing 12 and an insertion hole 50, into which a shaft 104 is inserted, is formed at a center of the collar member 46. In the collar member 46, a first discharge passage 60 extending along an axial direction is formed at a position located below the insertion hole 50 in a gravity direction and a second discharge passage 62 which extends so as to intersect with the first discharge passage 60 and communicates with the first discharge passage 60 is formed. In the housing 12, fluid entering the shaft hole 44 is discharged from the first discharge passage 60 to an outside through the second discharge passage 62 and an opening 72 opened at a lateral side of the housing 12.SELECTED DRAWING: Figure 2

Description

The present invention relates to a flow path switching valve capable of switching the flow path of the supplied fluid and outputting it to the downstream side.

Conventionally, a flow path switching having a plurality of supply passages to which a fluid is supplied and a single discharge passage through which the fluid is discharged, and a communication state between any of the supply passages and the discharge passage can be switched. Valves are known.

As disclosed in Patent Document 1, this flow path switching valve includes a housing, a valve body rotatably provided at an introduction port of the housing, and a rotating shaft connected to a central portion of the valve body. , The driving force of the electric motor is transmitted to the rotating shaft via a plurality of gears to rotate the valve body, and the communication state between the plurality of discharge ports and the introduction port is switched.

A shaft insertion hole through which a rotating shaft is inserted is formed in the housing along the axial direction, and a bearing for supporting the rotating shaft is provided inside the housing, and a seal composed of a set of seal rings is provided. It has a part.

A drain hole that penetrates outward in the radial direction and communicates with the outside is formed between one seal ring and the other seal ring in the shaft insertion hole, and the valve body is housed by this drain hole. The cooling water that has flowed from the body accommodating portion side over the seal portion into the shaft insertion hole is discharged to the outside.

Japanese Unexamined Patent Publication No. 2016-188702

However, in the flow path switching valve of Patent Document 1 described above, moisture, dust, etc. easily enter the shaft insertion hole through the drain hole opened to the outside. May cause malfunction.

The present invention has been made in consideration of the above-mentioned problems, and it is possible to suppress the ingress of water and impurities from the outside while surely discharging the fluid that has entered the inside of the shaft hole to the outside. It is an object of the present invention to provide a flow path switching valve.

In order to achieve the above object, the embodiment of the present invention has a housing in which the valve is rotatably housed, and a shaft connected to the valve is inserted into a shaft hole of the housing to rotate the valve. In the flow path switching valve that switches the communication state between the inside of the housing and the port opened in the housing below
Inside the housing, a first discharge passage and a second discharge passage that communicate with the shaft hole and extend in different directions are provided.
The first discharge passage extends along the axial direction of the shaft hole, the second discharge passage extends in the direction intersecting the first discharge passage, and communicates the first discharge passage with the outside.

According to the present invention, inside the housing constituting the flow path switching valve, a first discharge passage and a second discharge passage extending in different directions are communicated with a shaft hole through which a shaft connected to the valve is inserted. The discharge passage is provided, and the first discharge passage extends along the axial direction of the shaft hole, while the second discharge passage extends in the direction intersecting the first discharge passage, and extends from the outside to the first. 1 Communicates with the discharge passage.

Therefore, even when the fluid flowing into the housing under the rotational action of the valve enters the shaft hole, the fluid can be reliably discharged to the outside of the shaft hole through the first and second discharge passages. Moreover, by forming the extending direction of the first discharge passage and the extending direction of the second discharge passage to be different from each other, a shaft hole for moisture, impurities, etc. from the outside through the first and second discharge passages can be formed. It is possible to suppress the entry into.

According to the present invention, the following effects can be obtained.

That is, inside the housing, a first discharge passage and a second discharge passage extending in different directions are formed in communication with the shaft hole through which the shaft connected to the valve is inserted, and the first discharge passage is used as the shaft. In addition to extending along the axial direction of the hole, the second discharge passage extends in a direction intersecting the first discharge passage to communicate the outside and the first discharge passage. As a result, even if the fluid in the housing enters the shaft hole, the fluid is surely discharged to the outside of the shaft hole through the first and second discharge passages, and through the first and second discharge passages. It is possible to suppress the ingress of moisture, impurities, etc. from the outside into the shaft hole.

It is an overall sectional view of the flow path switching valve which concerns on embodiment of this invention. FIG. 5 is an enlarged cross-sectional view showing the vicinity of the shaft in the flow path switching valve of FIG. FIG. 3 is a cross-sectional view taken along the line III-III of FIG. It is a front view of the color member which constitutes the flow path switching valve shown in FIG. FIG. 5 is a plan view of the color member shown in FIG. 4 as viewed from the second discharge passage side.

A preferred embodiment of the flow path switching valve according to the present invention will be described in detail below with reference to the accompanying drawings.

The flow path switching valve 10 is used, for example, for the purpose of switching the supply destination of a fluid such as cooling water circulating in an internal combustion engine mounted on a vehicle, and as shown in FIG. 1, the housing 12 and the housing 12 have It includes a motor 14 to be housed, a valve mechanism portion 16 that switches a flow path under the driving action of the motor 14, and a gear mechanism 18 that transmits the driving force of the motor 14 to the valve mechanism portion 16. Then, the flow path switching valve 10 is fixed to the vehicle body or the like in the vehicle so that the axial direction (arrows A1 and A2 directions) of the housing 12 is substantially horizontal.

The housing 12 is formed from, for example, a resin material and houses a motor storage chamber 20 for storing a motor 14, a gear storage chamber 22 for storing a gear mechanism 18, and a valve 102 for a valve mechanism portion 16 to be described later. It is provided with a valve chamber 24. The housing 12 is arranged so that the motor storage chamber 20 is at the uppermost position (direction of arrow B1) and the outlet port 26 connected to the outer peripheral surface is at the lowermost position (direction of arrow B2).

The lead-out port 26 is formed in a tubular shape and is connected to the lower part of the housing 12, extends along the axial direction of the housing 12 (arrows A1 and A2), and extends at one end side of the housing 12 (arrow A1). The direction) is open and communicates with the valve chamber 24 on the other end side (arrow A2 direction). A pipe, a tube, or the like (not shown) is connected to the tip of the outlet port 26, and the fluid introduced into the valve chamber 24 is discharged to the outside through the outlet port 26.

Further, in the housing 12, one end side (arrow A1 direction) on the gear storage chamber 22 side opens through the first opening 28, and the other end side (arrow A2 direction) on the valve chamber 24 side is the first. 2 It is opened through the opening 30.

The motor storage chamber 20 is formed to have a substantially circular cross section, is formed so as to extend in a direction orthogonal to the axial direction (arrows A1 and A2 directions) on one end side of the housing 12, and the motor 14 is housed therein. It is fixed. The gear storage chamber 22 is formed so as to face the first opening 28 together with the motor storage chamber 20, and is provided downward (in the direction of arrow B2) adjacent to the motor storage chamber 20.

Then, in the housing 12, the first cover member 32 is attached to the first opening 28 in a state where the motor 14 is housed in the motor storage room 20 and the gear mechanism 18 is housed in the gear storage room 22. It is blocked by.

The valve chamber 24 has, for example, a circular cross section and is formed at a predetermined depth on the one end side (arrow A1 direction) while opening to the other end side (arrow A2 direction) of the housing 12 via the second opening 30. , Communicats with the other end of the outlet port 26 formed in the lower part of the housing 12.

The second opening 30 is opened so as to face the valve chamber 24, and is formed with a plurality of mounting portions 34 protruding radially outward from the outer edge portion thereof and a stepped shape from the inner peripheral surface thereof toward the radial outer side. It has an annular step portion 36 and the like. Further, in the center of the mounting portion 34, screw holes 38 extending along the axial directions (arrows A1 and A2 directions) of the housing 12 are formed. Then, the second cover member 40 is attached to the second opening 30 with the valve 102 housed in the valve chamber 24.

Further, as shown in FIGS. 1 to 3, the housing 12 has a connecting portion 42 for connecting one end having the motor storage chamber 20 and the gear storage chamber 22 and the other end having the valve chamber 24. It is formed. Then, inside the connecting portion 42, a shaft hole 44 extending in a straight line along the axial direction (arrows A1 and A2 directions) is formed.

The shaft hole 44 is formed so as to communicate the gear storage chamber 22 and the valve chamber 24, and a collar member 46 formed in a cylindrical shape is provided inside the shaft hole 44, and the diameter of the other end side (arrow A2) is reduced. In the direction), a shaft seal 48 is provided so as to be adjacent to the collar member 46.

As shown in FIGS. 1 to 5, the collar member 46 is formed from, for example, a metal material with a constant outer peripheral diameter along the axial direction (arrows A1 and A2 directions), and the shaft 104 is formed at the center of the axial direction. An insertion hole 50 to be inserted is formed.

The insertion hole 50 is formed to be slightly larger than the diameter of the shaft 104, which will be described later, and has a diameter expanded on one end side (direction of arrow A1) and a bush 52 is provided. It is provided with a second diameter-expanded portion 58 in which the diameter is expanded in the direction of arrow A2) and the bearing 56 is press-fitted. Then, the color member 46 is integrally insert-molded when the housing 12 is molded from the resin material. That is, the insertion holes 50 are formed so as to expand their diameters outward in the radial direction at both ends along the axial direction thereof.

Further, the collar member 46 has a first discharge passage 60 that opens into the second diameter-expanded portion 58 and extends eccentrically outward in the radial direction with respect to the insertion hole 50, and the first discharge passage 60. A second discharge passage 62 that communicates one end portion with the outer peripheral surface of the collar member 46 is provided.

The first discharge passage 60 is formed along the axial direction (arrows A1 and A2 directions) so as to have a diameter smaller than that of the insertion hole 50 and substantially parallel to the insertion hole 50, and the end surface of the second enlarged diameter portion 58 is formed. It extends in a straight line from the collar member 46 to the vicinity of the center in the axial direction. Further, the first discharge passage 60 is positioned so that a positioning pin P (see FIG. 5) is inserted from the other end side of the collar member 46 when the collar member 46 is integrally molded with the housing 12. Used as a hole.

Further, the first discharge passage 60 is formed on the inner peripheral surface of the second enlarged diameter portion 58 on the other end side (direction of arrow A2) and extends in the axial direction of the collar member 46 (FIG. 2 and FIG. (See Fig. 4). The discharge groove 64 is formed in a position on the inner peripheral surface that is downward in the direction of gravity (in the direction of arrow B2), is recessed outward in the radial direction in a circular arc shape, and is viewed from the axial direction of the collar member 46. It is formed in a shape overlapping a part of the first discharge passage 60. That is, the discharge groove 64 is formed so as to be in line with the first discharge passage 60 along the axial direction (arrows A1 and A2 directions) of the collar member 46.

Then, as shown in FIG. 2, when the bearing 56 is press-fitted into the second enlarged diameter portion 58, the bearing 56 is between the outer peripheral surface which is downward in the gravity direction (arrow B2 direction) and the housing 12. The provided discharge groove 64 communicates with the first discharge passage 60 in the axial direction (arrows A1 and A2 directions), and functions as a drain hole for discharging the fluid that has entered the inside of the shaft hole 44 to the outside.

As shown in FIGS. 1 to 5, the second discharge passage 62 has a width direction (in the directions of arrows C1 and C2 in FIGS. 3 to 5) orthogonal to the axial direction (arrows A1 and A2) of the collar member 46. It is formed in a slit shape that extends inward and is cut out by a predetermined depth inward in the radial direction with respect to the outer peripheral surface. Further, the second discharge passage 62 extends along the width direction with a constant width in the axial direction (arrows A1 and A2 directions) of the collar member 46.

The second discharge passage 62 intersects and communicates with one end of the first discharge passage 60 at the center in the width direction along the width direction, and the intersection D has a rectangular cross section and is connected to the first discharge passage 60. It is formed smaller than the passage diameter and the passage width of the second discharge passage 62 (see FIG. 5). Further, when the flow path switching valve 10 is fixed to the vehicle body or the like, the collar member 46 has the second discharge passage 62 downward in the direction of gravity (arrow B2 direction) and the first discharge passage 60. It is arranged so as to be downward in the direction of gravity (in the direction of arrow B2) with respect to the insertion hole 50.

In other words, in the collar member 46, the second discharge passage 62 extending in the radial direction intersects the first discharge passage 60 extending along the axial direction (arrows A1 and A2 directions) so as to be substantially orthogonal to the first discharge passage 60. It is connected and communicated.

Further, a part of the resin material constituting the connecting portion 42 flows into a part of the second discharge passage 62 when the housing 12 is molded, and when viewed from the axial direction of the collar member 46 shown in FIG. A sealing portion 66 that covers one side in the width direction (arrow C1 direction) of the second discharge passage 62 with the first discharge passage 60 as the center, and the other side in the width direction (arrow) from the lower end of the sealing portion 66 that is downward in the gravity direction. It has a guide portion 68 inclined downward (in the direction of arrow B2) toward (C2 direction).

As shown in FIG. 3, the sealing portion 66 is provided on one side in the width direction (arrow C1 direction) by a predetermined distance from the position facing downward in the gravity direction of the first discharge passage 60, and is provided in the second discharge passage 62. A wall portion 70 formed on the central side in the width direction is formed so as to extend along the direction of gravity (arrows B1 and B2 directions) while being formed in a substantially fan-like cross section that closes one side in the width direction. That is, the wall portion 70 is formed in the second discharge passage 62 at a position offset to one side in the width direction (arrow C1 direction) with respect to the first discharge passage 60.

The guide portion 68 is inclined at a predetermined angle from the lower end of the wall portion 70 in the sealing portion 66 toward the lower side in the gravity direction (arrow B2 direction), and the lowermost end portion thereof opens in the outer peripheral wall of the connecting portion 42. It is connected to the opening 72. The opening 72 opens in the lateral direction (width direction, arrow C2 direction) substantially orthogonal to the vertical direction (arrows B1 and B2 directions) of the housing 12.

As shown in FIG. 1, the second cover member 40 is formed, for example, in a substantially circular cross section corresponding to the opening shape of the second opening 30, and a plurality of mounting flanges protruding outward in the radial direction from the outer edge portion. 74, a plurality of introduction holes 76 provided along the circumferential direction offset radially outward from the center, and a convex portion having a circular cross section protruding from one end surface on the housing 12 side (arrow A1 direction). Includes 78 and. Although the case where the three introduction holes 76 are provided will be described here, the number is not particularly limited to this.

The mounting flange 74 is formed, for example, at a position and quantity corresponding to the mounting portion 34 of the housing 12, and a through hole 82 through which the fastening screw 80 is inserted penetrates in the center thereof in the axial direction. Then, the second cover member 40 is mounted so as to cover the second opening 30 of the housing 12, and the convex portion 78 is inserted into and engaged with the annular step portion 36 of the housing 12 in the radial direction and the axial direction. Positioned to.

Further, the mounting flange 74 comes into contact with the mounting portion 34 of the housing 12, and the fastening screw 80 inserted through the through hole 82 is screwed into the screw hole 38 of the mounting portion 34, whereby the second cover member 40 is formed. The second opening 30 is fixed to the other end of the housing 12 in a closed state.

The plurality of introduction holes 76 are formed, for example, having the same diameter in a circular cross section and penetrate in the axial direction (arrows A1 and A2 directions), and are formed by a predetermined distance from the center of the second cover member 40 formed in the circular cross section. It is provided on the outer side in the radial direction and at equal intervals along the circumferential direction.

Further, the second cover member 40 is formed with an annular recess 84 formed at a position facing the introduction hole 76 on one end surface on the housing 12 side (direction of arrow A1) and a position facing the introduction hole 76 on the other end surface. The formed annular groove portion 86 is formed. The annular recess 84 and the annular groove 86 are formed by being recessed in the axial direction with respect to one end surface and the other end surface, respectively.

An annular seal unit 88 is attached to each annular recess 84, and an introduction port 90 is attached to each annular groove 86. That is, the seal units 88 and the introduction ports 90 are provided so as to have the same number as the introduction holes 76.

The seal unit 88 is provided on the valve 102 side (direction of arrow A1) with respect to the annular recess 84 of the second cover member 40, and has a seat member 92 that is in sliding contact with the valve 102 and a second cover member with respect to the seat member 92. Includes a seal ring 94 provided on the 40 side (arrow A2 direction).

The seat member 92 is formed of a resin material such as Teflon (registered trademark) having a small coefficient of friction in an annular shape with a U-shaped cross section, and its bottom portion is sliding on the valve 102 side (arrow A1 direction). A communication hole 96 penetrating in the axial direction (arrows A1 and A2 directions) is formed in the center thereof.

The seal ring 94 is formed of, for example, an elastic material such as rubber in an annular shape having an X-shaped cross section, is housed in a groove of the sheet member 92, and has a second lip portion protruding outward from the sheet member 92. It is in contact with one end surface of the cover member 40.

The seal unit 88 is arranged on the outer peripheral side so as to surround one end side (arrow A1 direction) of the introduction hole 76, and the second cover is in a state where the bottom portion of the seat member 92 is in contact with the other end surface of the valve 102. The seat member 92 is pressed toward the valve 102 (in the direction of arrow A1) by the seal ring 94 in contact with the member 40. As a result, the seal unit 88 seals between the introduction hole 76 and the other end surface of the valve 102. The seal units 88 are provided in a quantity corresponding to the number of introduction holes 76, and the communication holes 96 of the sheet member 92 are arranged and communicate with each other so as to be coaxial with the introduction holes 76.

The introduction port 90 is, for example, formed in a tubular shape having a predetermined length along the axial direction, and has a flange portion 98 whose diameter is expanded outward in the radial direction at one end thereof and an axial direction from one end surface of the flange portion 98. It is provided with an annular protrusion 100 protruding in the (arrow A1 direction).

Then, in the introduction port 90, the flange portion 98 abuts on the other end surface of the second cover member 40, and the annular projection 100 is inserted into the annular groove portion 86, so that the introduction port 90 is coaxial with the introduction hole 76. The second cover member 40 is fixed so as to project in the axial direction (arrow A2 direction) from the other end surface of the second cover member 40. A pipe, a tube, or the like (not shown) is connected to the tip of the introduction port 90, and fluid is supplied from a device or the like (not shown).

For the motor 14, for example, a rotary drive source such as a DC motor or a stepping motor is used, and the motor 14 is housed in the motor storage chamber 20 of the housing 12, and a gear mechanism 18 described later is attached to the drive shaft (not shown). The constituent gears (not shown) are connected. The motor 14 is provided so that its axial direction is orthogonal to the extending direction of the shaft hole 44 (arrows A1 and A2 directions), and is driven based on a control signal from a controller (not shown) to drive the motor 14. Is driven to rotate.

The valve mechanism portion 16 has a disk-shaped valve 102 provided in the valve chamber 24 of the housing 12, and a shaft 104 connected to the center of the valve 102. The valve 102 includes a valve port 106 that opens at a position radially outward from the center.

The valve 102 is provided so that the other end surface on the second cover member 40 side (in the direction of arrow A2) faces the introduction hole 76 and is in sliding contact with the seat member 92 of the seal unit 88.

As shown in FIGS. 1 and 2, the shaft 104 has a predetermined length along the axial direction (arrows A1 and A2 directions) and is inserted into the shaft hole 44 of the housing 12 and the insertion hole 50 of the collar member 46. At the same time, it is rotatably supported by the bush 52 and the bearing 56. Further, the shaft seal 48 is in sliding contact with the outer peripheral surface of the shaft 104 to prevent impurities such as dust and fluid from flowing into the shaft hole 44 through between the shaft 104 and the housing 12.

The gear mechanism 18 includes a shaft gear 108 connected to one end of the shaft 104 and a worm gear 110 meshed with a gear (not shown) connected to the drive shaft of the motor 14. The shaft gear 108 is provided in the gear storage chamber 22 on one end side of the shaft 104, while the worm gear 110 is arranged between the shaft gear 108 and the motor 14.

Then, in the gear storage chamber 22, the worm gear 110 and the shaft gear 108 are arranged so as to be substantially orthogonal to each other and mesh with each other, so that the driving force of the motor 14 is transferred from a gear (not shown) to the shaft gear via the worm gear 110. It is transmitted to 108 and the shaft 104 rotates.

The flow path switching valve 10 according to the embodiment of the present invention is basically configured as described above, and its operation and action / effect will be described next.

First, in the fully closed state in which the plurality of introduction ports 90 are covered by the valve 102, each introduction hole 76 of the second cover member 40 is completely covered by the valve 102, and the communication between each introduction port 90 and the valve chamber 24 is cut off. Therefore, the fluid does not flow to the valve chamber 24. In other words, the valve port 106 of the valve 102 is in a state of not communicating with each introduction hole 76.

Next, when a control signal is input to the motor 14 based on a control signal from a controller (not shown), the motor 14 rotates in a predetermined direction, and the worm gear 110 meshed with a gear (not shown) moves to the shaft gear 108. And the driving force is transmitted.

Then, the shaft 104 to which the shaft gear 108 is connected rotates by a predetermined angle while being supported by the bush 52 and the bearing 56, and the valve 102 rotates together with the shaft 104 in the valve chamber 24. As a result, the valve port 106 is in a position facing one of the plurality of introduction ports 90, and one of the introduction ports 90 and the valve chamber 24 are in communication with each other through the valve port 106.

The fluid supplied from the introduction port 90 to the introduction hole 76 flows from the communication hole 96 of the seat member 92 to the valve chamber 24 through the valve port 106 of the valve 102, and from the valve chamber 24 to the outside through the outlet port 26. Is discharged.

On the other hand, when switching the fluid supply source for the out-licensing port 26, for example, by rotating the valve 102 and arranging the valve port 106 at a position facing another introduction port 90 (introduction hole 76), the valve port Another introduction port 90 and the valve chamber 24 are communicated with each other through 106. As a result, the fluid introduced into the valve chamber 24 through the other introduction port 90 and the introduction hole 76 is discharged to the outside through the outlet port 26.

Further, as described above, when the fluid flows into the valve chamber 24 through the introduction port 90, the fluid in the valve chamber 24 may infiltrate into the shaft hole 44 beyond the shaft seal 48. In such a case, as shown in FIG. 2, in the shaft hole 44, the fluid is housed along the discharge groove 64 and the first discharge passage 60 provided in the collar member 46 below the gravity direction (arrow B2 direction). It flows toward one end of 12 (in the direction of arrow A1), and flows downward in the direction of gravity from one end of the first discharge passage 60 to the second discharge passage 62 through the intersection D.

Then, as shown in FIG. 3, the fluid moves to the guide portion 68 which is downward in the gravity direction (arrow B2 direction) of the first discharge passage 60, and heads toward the opening 72 along the inclined guide portion 68. After flowing to the other side in the width direction (arrow C2 direction), the fluid is discharged from the opening 72 to the outside of the housing 12.

At this time, in the second discharge passage 62, the fluid dropped from the first discharge passage 60 does not flow to one side in the width direction (arrow C1 direction) by the sealing portion 66, and the other side in the width direction (in the direction of arrow C1) by the guide portion 68. It flows only to the opening 72 side provided in the direction of arrow C2).

As described above, in the present embodiment, a cylindrical collar member 46 that rotatably supports the shaft 104 is insert-molded inside the housing 12 constituting the flow path switching valve 10, and the collar member 46 is formed. , The first discharge passage 60 formed downward in the direction of gravity (in the direction of arrow B2) and extending in the axial direction with respect to the insertion hole 50 through which the shaft 104 is inserted so as to intersect at one end of the first discharge passage 60. It is provided with a second discharge passage 62 which is connected to and extends outward in the radial direction and communicates with the opening 72.

Therefore, even when the fluid in the valve chamber 24 enters the shaft hole 44 through which the shaft 104 is inserted, the fluid is preferably used through the first and second discharge passages 60 and 62 provided in the collar member 46. The opening can be reliably discharged from the opening 72 of the housing 12, and the extension direction of the first discharge passage 60 and the extension direction of the second discharge passage 62 are formed so as to be different from each other. It is possible to suppress the entry of water, impurities, etc. from the portion 72 into the shaft hole 44 (insertion hole 50) through the first and second discharge passages 60 and 62.

As a result, for example, it is possible to suppress malfunction due to water, impurities, etc. entering the insertion hole 50 of the collar member 46 and getting caught between the shaft 104 and the bearing 56, and the shaft 104 and the shaft. The valve 102 connected to the 104 can be smoothly rotated.

Further, in the collar member 46, the first discharge passage 60 is extended in the axial direction (arrows A1 and A2 directions), and the second discharge passage 62 is formed so as to intersect the first discharge passage 60. , The degree of freedom regarding the position of the opening 72 communicating with the second discharge passage 62 can be increased.

Further, one end of the first discharge passage 60 and the second discharge passage 62 are partially intersected, and the intersection D is made smaller than the passage cross-sectional area of the first and second discharge passages 60 and 62. The throttle can be easily constructed by the above, and this throttle can effectively prevent the ingress of water and impurities from the outside of the housing 12 into the first and second discharge passages 60 and 62 through the opening 72. it can.

Furthermore, the second discharge passage 62 is formed in the collar member 46 so as to extend in the width direction (arrows C1 and C2 directions) substantially orthogonal to the gravity direction (arrows B1 and B2 directions), and the gravity. The lower end of the first discharge passage 60 and the lower end of the second discharge passage 62, which are downward in the direction (direction of arrow B2), are formed apart from each other.

Therefore, by opening the opening 72 communicating with the second discharge passage 62 in the width direction side of the housing 12, it is difficult for water to enter from below the housing 12, and the second discharge passage 62 is formed through the opening 72. Even when water, impurities, or the like infiltrate through the lower end of the first discharge passage 60, it is possible to realize a structure in which it is difficult to reach the lower end of the first discharge passage 60.

Further, since the lower end of the second discharge passage 62, which is downward in the gravity direction (arrow B2 direction), is formed so as to be inclined downward in the gravity direction, the first discharge passage 60 to the second discharge passage 62 The fluid discharged to the surface can be suitably guided toward the opening 72 and discharged, and the fluid is prevented from staying in the second discharge passage 62. As a result, it is possible to improve the drainage property of the water that has entered the shaft hole 44 of the housing 12.

Further, by providing the first and second discharge passages 60 and 62 for the collar member 46, for example, a drainage passage is easily formed as compared with the case where the discharge passage is provided for the housing 12. It becomes possible.

Further, the first discharge passage 60 newly has a hole portion by utilizing a pin hole into which a pin P (see FIG. 5) for positioning when the collar member 46 is insert-molded with respect to the housing 12 is inserted. It is not necessary to process it, while the second discharge passage 62 can be easily formed by forming a notch on the outer peripheral surface of the collar member 46.

Furthermore, the bearing 56 is press-fitted into the second enlarged diameter portion 58 of the collar member 46 to form a drainage passage surrounded by the outer peripheral surface of the bearing 56 and the discharge groove 64, whereby the first discharge passage is formed. A drainage passage having a smaller passage cross-sectional area than the first discharge passage 60 can be provided on the upstream side of the 60. Therefore, even when water, impurities, or the like enter the first discharge passage 60 from the opening 72 through the second discharge passage 62, further entry from the first discharge passage 60 into the shaft hole 44 can be suppressed. ..

It should be noted that the flow path switching valve according to the present invention is not limited to the above-described embodiment, and of course, various configurations can be adopted without departing from the gist of the present invention.

10 ... Flow path switching valve 12 ... Housing 44 ... Shaft hole 46 ... Collar member 50 ... Insertion hole 60 ... First discharge passage 62 ... Second discharge passage 64 ... Discharge groove 66 ... Sealing part 68 ... Guide part 72 ... Opening 102 ... Valve 104 ... Shaft

Claims (5)

It has a housing in which a valve is rotatably housed, and a shaft connected to the valve is inserted into a shaft hole of the housing, and the inside of the housing and the housing are opened under the rotational action of the valve. In the flow path switching valve that switches the communication state with the port,
Inside the housing, a first discharge passage and a second discharge passage that communicate with the shaft hole and extend in different directions are provided.
The first discharge passage extends along the axial direction of the shaft hole, the second discharge passage extends in a direction intersecting the first discharge passage, and the first discharge passage and the outside are connected to each other. A flow path switching valve that communicates. In the flow path switching valve according to claim 1,
A flow in which the first discharge passage and the second discharge passage intersect and communicate with each other, and the intersection is formed smaller than the passage cross-sectional area of the first and second discharge passages. Road switching valve. In the flow path switching valve according to claim 1 or 2.
A flow path switching valve in which the second discharge passage extends in a direction substantially orthogonal to the gravity direction, and the lower end in the gravity direction and the lower end in the gravity direction of the first discharge passage are separated from each other. In the flow path switching valve according to claim 3,
The lower end of the second discharge passage in the gravity direction is a flow path switching valve formed so as to be inclined downward in the gravity direction from a position facing the connection portion with the first discharge passage. In the flow path switching valve according to any one of claims 1 to 4.
The first and second discharge passages are flow path switching valves provided in a collar member integrally formed inside the housing and forming a part of the shaft hole.

Images